How many legs did dinosaurs have?

All dinosaurs had four limbs. Some dinosaurs, like Tyrannosaurus and Allosaurus, were bipeds, which means that they only walked using their two hind limbs. Other dinosaurs, like Stegosaurus, Ankylosaurus, and Diplodocus, always walked on all four limbs, making them quadrupeds. And some dinosaurs walked on all fours, but ran on their two hind legs. Examples of such dinosaurs include Igaunodon and Parasaurolophus.